import RT-Thread@9217865c without bsp, libcpu and components/net

components/libc/posix/libdl/dlopen.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author        Notes
+ * 2010-11-17      yi.qiu   first version
+ */
+
+#include <rtthread.h>
+#include <rtm.h>
+#include <string.h>
+
+#include "dlmodule.h"
+
+#define MODULE_ROOT_DIR     "/modules"
+
+void* dlopen(const char *filename, int flags)
+{
+    struct rt_dlmodule *module;
+    char *fullpath;
+    const char*def_path = MODULE_ROOT_DIR;
+
+    /* check parameters */
+    RT_ASSERT(filename != RT_NULL);
+
+    if (filename[0] != '/') /* it's a relative path, prefix with MODULE_ROOT_DIR */
+    {
+        fullpath = rt_malloc(strlen(def_path) + strlen(filename) + 2);
+
+        /* join path and file name */
+        rt_snprintf(fullpath, strlen(def_path) + strlen(filename) + 2,
+            "%s/%s", def_path, filename);
+    }
+    else
+    {
+        fullpath = (char*)filename; /* absolute path, use it directly */
+    }
+
+    rt_enter_critical();
+
+    /* find in module list */
+    module = dlmodule_find(fullpath);
+
+    if(module != RT_NULL)
+    {
+        rt_exit_critical();
+        module->nref++;
+    }
+    else
+    {
+        rt_exit_critical();
+        module = dlmodule_load(fullpath);
+    }
+
+    if(fullpath != filename)
+    {
+        rt_free(fullpath);
+    }
+
+    return (void*)module;
+}
+RTM_EXPORT(dlopen);